Kappeln (Danish: Kappel) is a town in the district of Schleswig-Flensburg, in Schleswig-Holstein, Germany.

It is situated on the north bank of the Schlei, approx.

For the eastern Angeln and the northern Schwansen, Kappeln has center function.

In 1870 Kappeln received town privileges, after it was a Flecken.

A Flecken was a market town in Schleswig.